In Europe, information and expertise are now both more widely distributed and more readily accessible than ever before. At the same time, expectations of transparency and public accountability have increased. In many ways, knowledge is coming to play a new role in policy: we can now distinguish ’post-bureaucratic’ from conventional ’bureaucratic’ regimes and show that each presupposes a specific kind of knowledge and a specific way of using it. While bureaucratic modes of governance require ‘established’ bodies of knowledge to be translated into ‘vertical’ regulations; post-bureaucratic modes of governance consist rather in attempting to turn actors’ autonomy and reflexivity into a means of governing.